It would most likely be a violation of employment law to tell random people what happened. This is especially true if there was any "wrongdoings" or something like that.
You could obviously ask, but he may give a canned answer, lie to make himself not look bad, or tell the truth. You really won't know.
At the same time, you should probably see what another bank(er) is offering and see if you can get a better deal or higher level of services without paying additional, or a discount on current services. He is obviously going around to the bank's clients to make sure everyone doesn't jump ship.